<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>含有 noresize="noresize" 属性的框架结构</title>
</head>
<frameset cols="50%,*,25%">
  <frame src="https://www.w3school.com.cn/example/html/frame_a.html" noresize="noresize" />
  <frame src="https://www.w3school.com.cn/example/html/frame_b.html" />
  <frame src="https://www.w3school.com.cn/example/html/frame_c.html" />
</frameset>
<body>

</body>
</html>